| http://www.w3.org/ns/prov#value | - Ina table of the class described, the combination with a base having an inverted conical socket, an inverted cone rotatingly seated in the socket and having top-supporting arms in a plane below its upper end and at an angle other than a right angle to its axis, a top resting on the arms and recessed to receive said upper end of the cone, and a spring in the cone connected to draw it into the socke
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